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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9a9db7bc2698b2362959b91da0fd0bd28ab85cbeca08a0f01c3b42aa48203a' 
  AND token = 'STZB0jb0+6a0+kIrpqHO6ddqo71igEd+ZUaXWNT8pPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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