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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b119f05085a7602c7ba6fc721f61fddd114b4a78b9f99ad9a26bb4068d35e3f9' 
  AND token = '6MX6hlJzXc0JSkHnPqK6dMzhvIA5srf1b+agnaBJh4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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