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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6a96728eb9d9343d36c9da19692559e0b5aa6e70e9600befb39508ca8bca1a' 
  AND token = '3OYXjIV+m6Iw7PLYcHihvcWq/wzHguLexjVG5k8idTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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