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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c4c025d27191f1d0c2c2a9caf3210549eb18fa24c241c300cc5815580ccd59' 
  AND token = 'h7SKrpGxlxKKS58sE4MrwwM9BPMUd5Cj78qWhO22n+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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