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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a945ca8a6a23f9ad816d9d7f23dd9de2906f774c32053104ea6a0a7ca9349ca' 
  AND token = 'CRV16d14pECzPjpVBkUmeVj0eLSGTpVK0GM668Bpmh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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