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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07373c48460609331784c9af09ecd1c76ef7e7576994bf4a319f1588b695da5' 
  AND token = 'uxVqnzQYSemLmvqUWU/hQtJG0Pd58Jt1U5Uccmj3saE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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