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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3dddd08785a0b7317d2db6aa918c443103217604be8111cb3b9145b23616f3' 
  AND token = 'LQx+zPuQzco1NU12tFu20JQdQeOTd6uv9hDv+ARB8Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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