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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3902c3d6ef2c624d6f8665ed86566b08e2300d2fc3a3f8020534f0da4a3d0737' 
  AND token = 'FAE6RAba6pLVlpskp6OqUeR41Jl48JVqWrmBi+EGEmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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