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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96f230304b4da9cdf2fb1ae897d7af192f23b7d5fefc70fbe69a2eae8d81cf6' 
  AND token = '1oneNpTPhRQo4nhU5jedNdncfhAKRh9/s3ohCtmcJMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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