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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25a06c7b0fbb54cb46565e90596fe0e6fda3ef88a38613b0835abdd4a2dddb0' 
  AND token = 'pP5raFCix2pSNWDsUIJoABg9ZRP1O6h5UBZP0R5berc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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