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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09697c775f42f5565c1eaf4d170f8fcfda6b218d4d7a366fb5bf1b1130ff92f3' 
  AND token = 'PLAL3+qHSCSl0HF2l80Ig9bXSBnqef8ym3QRSLfG3NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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