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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0092105e162b8366ed3bdb755b1ff6bf45e7e6612abed10ccb28c903e9b3179a' 
  AND token = '/s5QRB9G5h25B9mwzy/P8rxOt8cTs36fEv0aInTk1Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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