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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fd2706f5ee76756b7fbda63f667959436778cf5e9d3b4c0e8e05969dbb4c35' 
  AND token = 'JT9f6pr1Uej1qV3EZluoyWzxKaglpzxm310/FKiStgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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