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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec84bf44c230c0f2553be5e1aa54bcbe5cb2ef158a1e9b8aa66a396e61a2527c' 
  AND token = 'UCpH3wjQnHwFmLeDUn2Yeng9hjX88Ck9Du4HcXSpyso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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