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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f655e81533b8c3f4e7efc9c31201556336af263071170bc700095908a3bb6a4c' 
  AND token = 'Dt7EZlqCm3GRNDciWLjU3Hl4aUh167N4wXtCQNUZVDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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