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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106ed4f2a772bc9a60db4bbe1cd8808b17d0606a64d4cb88f194693eb0350be2' 
  AND token = 'tO5P3IWCdCwhFvxk/77bvXqylecEAJdSNDv1k1rYuVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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