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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459e67fa9cb17c0236a93c79717ff7014c20eb7aae63a92ee2f667ddd76e43b2' 
  AND token = '9EHam1a4iOD3Oc7gUMCELGoH3J40y50fPQHVuEtERbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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