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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30b68357c62aa6cc7cfeabb442e5dba735ee57b9c2b6962610b58420eccaa44' 
  AND token = '7AKr93Qx/aExZJCTFx69+cY+ngZZ8mMgPH9pu1DxdIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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