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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074755987341e378c908049bf48244a9c7e09524732556c62f44372e5100ae09' 
  AND token = '37VpwCq2VsyOVMYnOOH3eNqtbtVRNvq3k1epQNM0JY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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