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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50c741311688cdb49b04b7e60ac0af39dc5c775051f0d3fa171d329b57dc1d1' 
  AND token = 'ndrZGG5VoMZPz6PuCHa78L2NxD2IoaZcB7lbYsdGdTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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