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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7b9b9a9412aa9e28f4d99b846224677227353bcbd0b32c18f2aa0c1bc7443e' 
  AND token = 'LPghcj4orlabCd5qTWUHCGlYuRKyWgh4rPKyoiMfwaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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