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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa04a1478497225cc69550f2e2bcfc87dcb12b0670489236b79642faa6c5fb9' 
  AND token = '4LaMl8+250rAOhTAuYOsVnn55aaEfmPPmIwSZABNqpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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