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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf51676423100507285400a035104acd6814eb971097384d5d75a36558c8f92' 
  AND token = 'bFzvi7idYY/VzfsHedxNtsPTTmS4NV/Fo7MQd0wvYQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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