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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47703aa047bf5628cdb4aff7112dbf037cada7b3be88b1c6becc8f1e9049738f' 
  AND token = 'WgCe9vvDIEkAildeS0f1XmVuKxnVxy+ZkRtFKMcMS7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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