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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d91bc03c6d24058de32ab58305e0e20b858cce8aff3aeb8edb6d4f8a1b012d3' 
  AND token = 'RHmm4DEbapsIALpJy9egfyrtYp310IE5CycLl/YTBSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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