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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4ebb272a3c0abe80f5f3ef8182133e0f3183cb23fe93216c9f73f0e31346ee' 
  AND token = 'Rl0GcYaS1ZjSCvSK5Wu13x96/PkM/Gpl0kjtEuFZg54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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