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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c62e5a2b11b43abea7ab81585625d8ed82d4e00d667394194d9c6320a0920ab' 
  AND token = 'abEbLjBqD1wzSaJvBvAGTaPaIehkGEHK2PICyAtJG1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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