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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba116a0a6a62c3b6b9300eee341838266ad79467557333bffc9c9ec99777553' 
  AND token = '7UugJqJaI3bBdVPuUT07+jUB3eDcQ7mpF4CW59HkD54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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