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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4c67aa06b395c2795477a64723a4124b7944d7749bb0c8ea99aa7966096291' 
  AND token = 'rur8UwNziHAZo4J9qk8FDLAVjDt9IiMR4kW62VbdbBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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