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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322014b3e59258c8ec196e42bd72224fe6d5fc1133600e2d60422e9f278d3b41' 
  AND token = 'H8m+IuBlVsrOxt+cS0FpZTjR06CObP9ZAHldTY6pK44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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