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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f8100441cd0020a114a53409124dba978dd0eb88b96ee8e1ba736e15be57ea' 
  AND token = 'OLOqTjelxFw03c5EYwNH5BW6TB5wHQEf9CIkrFjBsOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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