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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de13b8284f3f9c37475a63ef21756a918280b9f07d01d64627219ff331a1fc08' 
  AND token = 'o1OktEih9y4x48JAX6OS+NWl+dTDzPlncl+PmZHvS10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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