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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661d8ee8cb8f2cdd6d9880576c18bac2e827e5e8031d4b46687660eca77c0190' 
  AND token = '20DZmQophcJ7TS/+xdCkJPzvFcsnIAO2YcaRXDD8B08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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