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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081b3909b7f78eaf84e9ac0234667a1067390ccdce16577cb6e0733c704bab30' 
  AND token = 'FgWmrj2nnVV+EgSMK8RYIJ8f7MmkFV8kNHf6kNzBY6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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