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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002e4d9450c8107c3d177d626d2c0540ef2fdd4d03124f84ea8adf8ccd3962c6' 
  AND token = 'ca7BkI0vwr9VnJJ6vjsxlmkeLFTlTWCo2dQsJdGRk4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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