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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e22e006bf1f2787e91293c7e2fd3bedf106996d23c4d0c9a99518eb8405b5fde' 
  AND token = 'BDwog62Zcle4tB1Aqkh8HqAIn53J0LwXL1SZLFf5gCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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