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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d6668bef45a47da5751921aac1e7329deb4d61c1dc4a0c3d4c24a275d058c4' 
  AND token = 'zTMpyj2TbJ6c9Vqm8uI/wPtTbtRli/G8lBZN3/4nJ9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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