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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffec454c9107445b0421fa1198e248fb7f83fd62d269d80ee8c7785c26d8c7f9' 
  AND token = 'SPGwkDGsQO0mJNfBpVUir701Y69/hXdPyYb0i0atoao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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