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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad42132b4c049ae0db1f67c8b35433ffa3cc87d41d53e69094a4e2e04a668f29' 
  AND token = 'C97atguTgDXI1umBY9YIDHgUVQUTiyh5ex2opCpa04o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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