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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5450062ca60547b3451ce8a41b9d22a69930fa6da66a8dca719271bc72a8b06f' 
  AND token = 'zKZScqwa29aK91ezdfjv1t1YXZWei8+igZmRjLEJ/jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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