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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3a6ca9edd1df829d1533cb903122402b4c68c40c75cc4ab73aaba5d1d8f8e3' 
  AND token = 'JbBGX6TJt/Tiln1fuG4n1u1J+LhRDNeHqj4c/0KXnmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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