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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c518cea0b405f8a678d934b44a866c0acfe20b52e0cef06c3d22d22a2c0afda1' 
  AND token = 'AaTYyqC5pBXyzcusSyIu0/GeqtroXYeVIaushHjXzvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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