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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e8af4c15b7e084f0cbb4c71e5aadc3bab103bd442a605c9a7486ded47ca3fc' 
  AND token = 'EMSXcZtncwEEvJvY4iYc73rHg7XgA4Rg/COaIaZ/o2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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