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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef366a167c6d4498280fb4cb3cf6d6636d9c006ed42006cd021cc643b9261726' 
  AND token = '0/yn57dYzniMjTMhOrYxRJWXq2/aiict2SHCqGo5MCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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