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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e73c525699a02065714835e4e9fe9eba0802dc46009a44ba7b328a1dd3be12' 
  AND token = '6RhRPY73vhplWWmo+U+y3NXupDSx0Cpfsx7VlYEHnkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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