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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31795ea36c1181f3150fc413c6795f1f3a0b126bda1a6a9bb88f47d2ff63ce9d' 
  AND token = '3JfcdH4Sc8sPeCuOabvG8cstkkaJRH4t5LkDtXrmlXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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