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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46026f451e6343a9eb362edb36f2901f8c6812e1a1f13562be7d535aeb8b9da2' 
  AND token = '0EsdErAQxBOrEkhAjiG81NqZKNBnhlfglzSAKxoHUqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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