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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1959724a1c20eb09a5c4152eef162950b83ea7fb39bf857ae4e0d66276275f5' 
  AND token = '6Bzuc62C6YFeqiRx/nQzk9BgUAoVK43mQwozongQRBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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