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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66da22c223657d1561e07aa2dfb66c2218f0f986cc3a5fae0b7b3026cd66e70a' 
  AND token = 'jVm9EChd6LAdZvn6XX58IMXOA36R/gVFLV3TAEJaw5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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