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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3e7a746a49a45a6a2c8df9c6367df549aae50a8894a5b7b323373d51291774' 
  AND token = '96PSPs3h4SCa9J0apBD9s+OSbiZ2kRl26p8OkjPBX6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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