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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad33cbc5e97cbdad2c637957c006b0e095ba95f59791d8479095a8c3e1d69998' 
  AND token = 'oKJVGB3h2iW65slLBaRCNRZjnxL83fhxJzHy9pbZEc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}