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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6387f899748141c8998aa5a7cf5554715278f07e8d554357c31a58e7500180' 
  AND token = 'E06SFKiXZbjibhMM93Ik9a9oi9xekATREOu28iPPezo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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