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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b894e6caf0195605a30335a01291a8c177a28dc68bfd2b2c0b555a0703c6dcb' 
  AND token = 'DwfSA7JphLvqH9QITPpDrYeH00tK0lySSR/9CfIeI60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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