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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee82a2bb332847e47a0fa814d71197c66d447fdea1badcb2a864cc2949a78aaf' 
  AND token = 'KSelQTKLDjTkvVYYFcQ9hVFLdqQ0c/X/xBDOwrj1k4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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