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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907aee655d52cfb30fa7aed25a78af17a05084ec3c10e739a14ebd7413cb07e0' 
  AND token = '78G5qjsqc20SweeXIzuEujzzTqs/MNaXSTBAA4yJ8v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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