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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5044b1eab9b6b8671a372bca31ca45e560b971f69231d5e733daeff6fc17ce6b' 
  AND token = 'zzvd7DUMzsBesN3Kq8T0NPLasHeonF+8CYIF5HH/nqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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