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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1b9a87185aad6a6586a191cf98894ff70cd5f20a3ca9b8bbf2b651dde6d008' 
  AND token = 'ZcLLuUI3ZnrUqzXg+KQQbaBQeVBM2UxFfcG18aFY9m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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