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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46235c91778335d0c92745d374a15c6654d0bfd98b93629c820d25c06922a72e' 
  AND token = 'xtMiTGcyOKnVd88rCz3+ObPNmB7EGLAHrn4sglUXtfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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